Yolk granules

Yolk granules

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Credit: DR ELENA KISELEVA/SCIENCE PHOTO LIBRARY

Caption: Yolk granules. Coloured scanning electron micrograph (SEM) of yolk granules (green) in an extract of cytoplasm taken from a frog (Xenopus sp.) oocyte (egg). Yolk granules are storage bodies for a type of lipoprotein called vitellin, which nourishes the embryo during the first stages of development. The blue structures are endoplasmic reticulum (ER) vesicles. The ER is a membrane-bound cell organelle that is the site of lipid synthesis and the production of membrane- bound proteins.

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Keywords: biological, biology, coloured, cytology, cytoplasm, egg, embrology, endoplasmic reticulum, er, false-colour, false-coloured, food, frog, granules, lipoprotein, oocyte, organelle, sac, sacs, scanning electron micrograph, scanning electron microscope, sem, ser, smooth, storage, store, vesicle, vesicles, vitellin, xenopus sp., yolk granule

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